Fair Value Measurements - Carrying Values and Estimated Fair Values of our Financial Instruments not Measured at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Assets:
Mortgage and other loans receivable	$ 3,314	$ 3,868
Other investments	8,361	9,828
Short-term investments	9,417	14,462
Cash	1,589	1,302	$ 1,472
Other assets	4,602	4,735
Liabilities:
Fortitude Re funds withheld payable	3,094	3,207
Consolidated Entities, Excluding Consolidated Investments
Liabilities:
Long-term debt	9,087	8,764
Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary
Liabilities:
Long-term debt	156	158
Estimated Fair Value
Assets:
Mortgage and other loans receivable	3,265	3,752
Other investments	501	583
Short-term investments	4,557	4,673
Cash	1,589	1,302
Other assets	2	15
Liabilities:
Fortitude Re funds withheld payable	3,197	3,335
Estimated Fair Value | Consolidated Entities, Excluding Consolidated Investments
Liabilities:
Long-term debt	8,782	8,221
Estimated Fair Value | Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary
Liabilities:
Long-term debt	156	158
Carrying Value
Assets:
Mortgage and other loans receivable	3,314	3,868
Other investments	501	583
Short-term investments	4,557	4,673
Cash	1,589	1,302
Other assets	2	15
Liabilities:
Fortitude Re funds withheld payable	3,197	3,335
Carrying Value | Consolidated Entities, Excluding Consolidated Investments
Liabilities:
Long-term debt	9,087	8,764
Carrying Value | Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary
Liabilities:
Long-term debt	156	158
Level 1 | Estimated Fair Value
Assets:
Mortgage and other loans receivable	0	0
Other investments	0	0
Short-term investments	0	0
Cash	1,589	1,302
Other assets	2	15
Liabilities:
Fortitude Re funds withheld payable	0	0
Level 1 | Estimated Fair Value | Consolidated Entities, Excluding Consolidated Investments
Liabilities:
Long-term debt	0	0
Level 1 | Estimated Fair Value | Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary
Liabilities:
Long-term debt	0	0
Level 2 | Estimated Fair Value
Assets:
Mortgage and other loans receivable	336	339
Other investments	494	578
Short-term investments	4,557	4,673
Cash	0	0
Other assets	0	0
Liabilities:
Fortitude Re funds withheld payable	0	0
Level 2 | Estimated Fair Value | Consolidated Entities, Excluding Consolidated Investments
Liabilities:
Long-term debt	8,782	7,981
Level 2 | Estimated Fair Value | Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary
Liabilities:
Long-term debt	0	0
Level 3 | Estimated Fair Value
Assets:
Mortgage and other loans receivable	2,929	3,413
Other investments	7	5
Short-term investments	0	0
Cash	0	0
Other assets	0	0
Liabilities:
Fortitude Re funds withheld payable	3,197	3,335
Level 3 | Estimated Fair Value | Consolidated Entities, Excluding Consolidated Investments
Liabilities:
Long-term debt	0	240
Level 3 | Estimated Fair Value | Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary
Liabilities:
Long-term debt	$ 156	$ 158